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From Markus Reich <markus.re...@markusreich.at>
Subject Re: Detached Cayenne Objects
Date Thu, 20 Apr 2017 12:00:10 GMT
Hi Michael,

I checked the stacktrace again, it's my fault, the expensive operation was
the reflection on the getter and setter :-/
The coding was pretty old, so I don't need reflection in my case ;-)

Here the old approach
Object value = Reflect.on(source).call("get" +
StringUtils.capitalize(objAttribute.getName())).get();
Reflect.on(target).call("set" +
StringUtils.capitalize(objAttribute.getName()), value);

Now I switch to
Object value = source.readPropertyDirectly(objAttribute.getName());
target.writePropertyDirectly(objAttribute.getName(), value);

I think this will give my application a real kick :-)

br
Markus



Michael Gentry <blacknext@gmail.com> schrieb am Do., 20. Apr. 2017 um
13:28 Uhr:

> Hi Markus,
>
> As you have discovered, Cayenne objects need to be in a context when
> relationships are involved.  I'm curious why you think creating a context
> is very expensive, though?  It should actually be pretty cheap
> memory/cpu-wise.
>
> As for copying objects, are you copying committed objects or copying
> new/modified objects and you need the new values?
>
> mrg
>
>
> On Thu, Apr 20, 2017 at 7:12 AM, Markus Reich <markus.reich@markusreich.at
> >
> wrote:
>
> > Hi,
> >
> > I have a very special problem :-/
> > We want to use a cayenne object as detached object, for a simple object
> > this works fine, as the attribute values are hosted in a value map, but
> we
> > need a context when we want to use  the relations too :-/
> >
> > What would be the best approach?
> > At the moment we create the object in a second context and copy the
> > attributes / relations with reflection (deep copy) as we have a lot of
> this
> > objects, creating context is very expensive and we want to reduce costs
> :-)
> >
> > br
> > Markus
> >
>

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